- What is a sector gear lever?
- Yes, a Systema switch assembly will fit
- For your setup, I'd highly recommend either the Prometheus Max Torque gear set or the Systema Infinity torque up gear set
- You will require a half-tooth piston to work with either of those gear sets.
- You have no choice as to helical or flat with those gear sets... they ONLY come in helical teeth
- I'd also recommend a MOSFET for your setup so that you don't burn out your contact plates
- I'd also recommend a high torque motor, such as a Systema Magnum motor
- Bore up cylinder kits will fit - the kit comes with the appropriate nozzle, so no worries about the PGC one
- What do you mean by "lay the wire backwards"? Do you mean to the rear stock? The gearbox is built to allow wiring to either the front or the back of the gun, but it's easier to get it to rear power
I had it installed in my SPR, rear-powered by a Crane stock:
Hop up sleeve:

(the black rubber part)